The downing of Malaysia Airlines Flight 17rippled across multiple continents — from Amsterdam, where friends and family had just seen off their loved ones, to the distant shores of Asia and Australia that had been waiting for 298 passengers and crew who would never show up. 

The jetliner is much more than a machine used to get from one spot to another.  It can represent hope, modernity and a country's power. And when things go wrong, that once mighty plane can bring about deep national disgrace.

President Barack Obama directed U.S. officials on Thursday to do all they could to support an investigation into what caused a Malaysian jetliner to crash in a Ukraine war zone and pledged support to the affected countries as the probe moves forward.

Malaysia Airlines flight 370 (MH370) is presumed to have crashed into the southern Indian Ocean, “about as close to nowhere as it’s possible to be, but . . . closer to Australia than anywhere else,” according to Australian prime minister Tony Abbott. In response, Australia’s formidable humanitarian assistance and disaster relief/search and rescue (HADR/SAR) machine has sprung into action.

With malicious intent strongly suspected in the disappearance of Malaysia Airlines Flight 370, American intelligence and law enforcement agencies renewed their search over the weekend for any evidence that the plane’s diversion was part of a terrorist plot. But they have found nothing so far, senior officials said, and their efforts have been limited by the Malaysian authorities’ refusal to accept large-scale American assistance.

The mysterious disappearance of Malaysia Airlines flight MH370 has drawn nearly every navy with a presence in Southeast Asia to aid in the search effort. The United States easily has the biggest and best equipped navy in the Pacific and was fast to participate after the flight carrying 239 passengers and crew vanished from radar on Saturday.